His first argument didn't work, so he brought out the 'heavy artillery'. [=he started using a different and more powerful argument]
The troops were being bombarded by 'artillery'.
The troops were under heavy 'artillery' fire.
(..) (SCREECHING) TYR: Jane Foster? You need to come with us. We are still unable to restore the palace shields. Our artillery cannot detect them. Even Heimdall cannot see them. My king, we are all but defenseless. She's your prisoner now? (..)2013 Thor: The Dark World